NUCLEO-H753ZI overcurrent

[giwonKIM]

Hi, I'm using NUCLEO-H753ZI Board. 

There was a mistake while conducting the experiment.

After that, the red light on LED6 came on and the red light on LED6 came on again after disconnecting the cable.

Looking at the User Manual, LED6 comes out as Over Current indication, is there a way to fix it?
(https://www.st.com/resource/en/user_manual/um2407-stm32h7-nucleo144-boards-mb1364-stmicroelectronics.pdf)

Power is supplied by Micro USB 5V.

Please fix my board!!

If you have any question, please ask me.

Thank you.

[TDK · Accepted solution]

If overcurrent LED is on when you have connected normal USB power, the hardware is damaged. Probably the LDO, but it could be the STM32. No details on what the mistake was. You would need to diagnose which chip is busted and replace it. Feeling for which chip is hot will probably tell you where the problem is.

If you have the tools and skills to replace SMD components, it's possible. Otherwise, probably easier to buy a new board.

[giwonKIM]

I think that buying a new board is easier than fix the old board.

Thank you for answer.

[Metyus]

Hello.

Facing a similar issue on the Nucleo-U5A5ZJQ, boards are nearly identical in regard to this fault. Connecting to the Board through CN1 with JP6 in 5V_STLK lights RED LD6 up. I can upgrade firmware on STLINK in CubeIDE, but while debugging "Error in initializing ST-LINK device.".

Manual says:
Red STLINK-V3E USB OC power switch fault LED (LD6)
The red LED (LD6) indicates that the board power consumption on the USB exceeds 500 mA.
• If 500 mA or more is expected, the board must be supplied by one of the external 5 V sources compatible
with more than 500 mA capability.
• If more than 500 mA is not expected, the board must be analysed to understand the extra consumption.

If I replace JP6 to 5V_USB_C and connect PSU to CN15 and laptop to CN1 STLK LD6 is OFF and LD5 is ON (lights up green). Same issue in debugging - "Error in initializing ST-LINK device."

U10, which is 3v3 LDO heats up to 63.8 C and 3v3 pin output is 0.282, although many chips are heating up this one draws my attention the most. Am I safe to assume U10 is causing this issue and replacing it the way to fix the board?

Thank you.